Joseph w



(No Model.)

J. W. NORCROSS. PULLBY BLOCK.

No. 243,952. PatentedJuly 5,1881.

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UNITED 'STATES PATENT OFFICE.

`JOSEPH W. NORCROSS, OF LOCKPORT, NEW YORK.

PULLEY-BLOCK.

SPECIFICATION forming part of Letterslatent No. 243,952. dated July 5,1881,

Application led May 16, 1881.

To all whom it may concern:

Be it known that I, J osEPH W. NoRcRoss, a citizen of the United States,residing at Lockport, in the county of Niagara and State of New York,have invented new and useful Improvements in Pulley-Blocks, of which thefollowing is a specification.

This invention consists in the combination, in apulley-block, of woodensides or cheeks, metallic frames or straps secured to the outer surfacesof said cheeks, lugs extending from the metallic frames or straps beyondthe inner edges of the cheeks, inside metallic straps extending throughthe lugs, a cap provided with slots to catch over the ends of theiusidestraps, anda key for locking the parts together. With the key iscombined a pin provided with grooves, which engage with the edges of theholes in the inside straps, so as to prevent the straps from spreadingorfrom bending inward.

This invention is illustrated in the accompanying drawings, in whichFigure 1 represents a face view of my pulley-block. Fig. 2 is a verticalsection in the plane x m, Fig. 1. Fig. 3 is a horizontal section in theplane y y, Fig. 1. Fig. 4 is an end view of the outside metallic frame.Fig. 5 is a plan of the cap detached. Fig. 6 is a face view of one oftheinside straps detached.

- Similar letters indicate corresponding parts.

In the drawings, the letters A A designate the wooden sides or cheeks,which are of the usual form or shape. To the outer surface of each ofthese cheeks, is secured a metallic frame, B, whichis, by preference,provided with a ange, a, that hugs the edge of the cheek; but theseflanges may be left off, or, if desired,

` simple straps may be substituted for the frames.

Each of these outside frames or straps is provided with two lugs, b b,which project beyond the inner edges of the cheeks, A, and are providedwith slots c, Fig. 4, through which extend the inside metallic straps, CO, each of (No model.)

ends ofthe inside straps, C C, and with acentral slot, f, to make roomfor the hook F. The cap E is locked by means of a key, G, which extendstransversely through holes or slots g in the inside straps, and whichforms the sup.- port for the hook F. This key may be made in anysuitable manner; but I prefer to construct the same in two parts, h i,each of which forms a wedge rounded on its outside and flat on itsinside, (see Fig. 2,) so that when the two parts are placed togetherthey form a round pin. The upper part, h, of the key is provided withgrooves j j, one at each end and at such a distance apart that they canbe made to engage with edges of the holes or slots g in the insidestraps, C C, and by inserting the lower part, i, the part h is driven upand the cap E down, and all the parts are irmly locked together. Theobject of the grooves jj is to prevent the ends of the straps frombending either inward or outward.

In the example shown in the drawings the inside straps of both cheeksare connected at one end by a cross-piece, 7c, which is perforated witha hole, l, Fig. 2, to receive the becket; but instead of thisconstruction the straps may be made detached from each other, and asecond cap may be applied, the same as above described.

The outside frame or strap is provided with a hub, m, which extendsclear through the cheeks and abuts against the inner surface of theinside strap, C, (see Fig. 2,) so that the riournal of the center pinruns in a continuous metallic bearing. The hub mis, by preference,eccentric, as shown in Fig. l.

By these means a pulley-'block is obtained which is strong and durableand not liable to get out of order. My invention is also applicable todouble or multiple blocks by extending the` cap or caps across all thecheeks in the block.

My invention is further applicable to pulleyblocks constructed ofoutside frames or sides with in wardly-projecting anges or lugs b b, andwith hubs, and of inside straps which extend through slots in the lugs bb,.the whole being locked together by the keys Gr. In this case nocheeks are required.

What I claim as new, and desire to secure by Letters Patent, is-

IOC

l. The combination, substantially as hereinbefore described, of thewooden sides or cheeks, the' metallic frames or straps secured to theouter surfaces of said cheeks, the lugs extending from the outsideframes or straps beyond the inner edges of the cheeks, the insidemetallic straps extending through the lugs, the cap provided with slotsto catch over the ends of the inside straps, and the key for locking theparts together.

2. The combination, substantially as hereinbefore described, of theWooden sides or cheeks, the outside metallic frames or straps, the lugsextending from the outside frames or straps beyond the inner edges ofthe cheeks, the inside metallie straps extending through the lugs, thecap provided with slots to catch over the ends of the inside straps, thetapering pin h, provided with grooves to engage with the edges of theholes or slots in theinside straps, and the key t', for locking theparts together.

3. The combination,substantially as hereinbefore described, ofthemetallieframesor sides, the inside straps, the lugs b b, projecting fromsaid frames or sides extending through said lugs, the hubs or bearingsformed on the frames or sides extending inward toward the inside straps,the center pin which forms the axle of the sheave, and the key or keysfor locking the block together.

ln testimony whereof I have hereunto set my hand and seal in thepresence of two subscribing witnesses.

JOSEPH W. NOROROSS.

Vitnesses:

W. HAUFF,

E. F. KASTENHUBER.

